SF patch 1547796 by Georg Brandl -- set literals.
diff --git a/Python/import.c b/Python/import.c
index d80611e..49e844a 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -66,9 +66,10 @@
        			    storing constants that should have been removed)
        Python 3000:   3000
        	              3010 (removed UNARY_CONVERT)
+		      3020 (added BUILD_SET)
 .
 */
-#define MAGIC (3010 | ((long)'\r'<<16) | ((long)'\n'<<24))
+#define MAGIC (3020 | ((long)'\r'<<16) | ((long)'\n'<<24))
 
 /* Magic word as global; note that _PyImport_Init() can change the
    value of this global to accommodate for alterations of how the